TABLE 4

Interobserver and Intraobserver Variability for V/Q Scintigraphy with ^81mKr

Variability	Consensus		Observer 2		Observer 1
Variability	Mismatch	Match	Mismatch	Match	Mismatch	Match
Local
Mismatch	46	6	44	4	46	5
Match	6	34	6	25	6	25
Observer 1
Mismatch	48	4	47	3	29	2
Match	3	27	1	23	1	16
Observer 2
Mismatch	46	4	29	3
Match	2	27	1	13

^81mKr V/Q scintigraphy	n	κ (95% CIs)	McNemar
Local vs. consensus	92	0.74 (0.60–0.88)	1.0
Observer 1 vs. consensus	82	0.82 (0.69–0.95)	1.0
Observer 2 vs. consensus	79	0.84 (0.72–0.96)	0.69
Observer 1 vs. local	82	0.71 (0.56–0.87)	1.0
Observer 2 vs. local	79	0.73 (0.58–0.89)	0.75
Observer 1 vs. observer 2	74	0.88 (0.76–0.99)	0.63
Observer 1 vs. observer 1	48	0.87 (0.72–1.0)	1.0
Observer 2 vs. observer 2	46	0.80 (0.62–0.99)	0.63

Number of patients varies because of variation in indication for ventilation. Interobserver agreement is given in lightface type. Numbers in boldface type indicate intraobserver agreement.